Along a street lined with walled mansions shaded by graceful jacaranda trees, mourners, black and white, by the thousands rubbed shouldersoutside the villa where Nelson Mandela died, placing flower bouquets and condolence notes on top of piles already knee-high. Others danced while singing praise for the anti-apartheid leader — a vivid example of the "Rainbow Nation" unity of race-blind multiculturalism championed by Mandela for South Africa.